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Akutan

Estratovolcán · United States · 1303 m

Akutan has a 2-km-wide summit caldera with a large scoria cone that rises above the caldera rim. It is seen here from the south in eruption on 11 February 1987. A small lake occupies part of the caldera floor. The caldera rim is breached narrowly on the north side through which a 1978 lava flow traveled to within 2 km of the sea.
Akutan has a 2-km-wide summit caldera with a large scoria cone that rises above the caldera rim. It is seen here from the south in eruption on 11 February 1987. A small lake occupies part of the caldera floor. The caldera rim is breached narrowly on the north side through which a 1978 lava flow traveled to within 2 km of the sea. · Foto: Photo by Jerry Chisum (Mark Airways), 1987 (courtesy of John Reeder, Alaska Div. Geology & Geophysical Surveys). · Wikimedia Commons
Tipo
Estratovolcán
País
United States
Región
América del Norte / Aleutian Ridge Volcanic Arc
Altitud
1303 m
Coordenadas
54.134, -165.986
Última erupción
1992
Contexto tectónico
Subduction zone / Intermediate crust (15-25 km)
Forma volcánica
Composite
Roca principal
Basalt / Picro-Basalt
Resumen geológico

Akutan contains a 2-km-wide caldera with a large cinder cone in the NE part of the caldera that has been the source of frequent explosive eruptions and occasional lava effusion that covers the caldera floor. An older, largely buried caldera was formed during the late Pleistocene or early Holocene. Two volcanic centers are located on the NW flank. Lava Peak is of Pleistocene age, and a cinder cone lower on the flank produced a lava flow in 1852 that extended the shoreline of the island and forms Lava Point. The 60-365 m deep younger caldera was formed during a major explosive eruption about 1,600 years ago and contains at least three lakes. A lava flow in 1978 traveled through a narrow breach in the north caldera rim almost to the coast. Fumaroles occur at the base of the caldera cinder cone, and hot springs are located NE of the caldera at the head of Hot Springs Bay valley and along the shores of Hot Springs Bay.

Resumen de Wikipedia

Resumen en inglés

Mount Akutan, officially Akutan Peak, is a stratovolcano in the Aleutian Islands of Alaska. Akutan Peak, at 4,275 feet (1,303 m), is the highest point on the caldera of the Akutan stratovolcano. Akutan contains a 2 km-wide caldera formed during a major explosive eruption about 1600 years ago. Recent eruptive activity has originated from a large cinder cone on the NE part of the caldera. It has been the source of frequent explosive eruptions with occasional lava effusion that blankets the caldera floor. A lava flow in 1978 traveled through a narrow breach in the north caldera rim to within 2 km of the coast. A small lake occupies part of the caldera floor. Two volcanic centers are located on the NW flank: Lava Peak is of Pleistocene age; and, a cinder cone lower on the flank which produced a lava flow in 1852 that extended the shoreline of the island and forms Lava Point. An older, mostly buried caldera seems to have formed in Pleistocene or Holocene time, while the current caldera formed in a VEI-5 eruption c. 340 AD. AVO has recorded 33 confirmed eruptions at Akutan, making it the volcano with the most eruptions in Alaska.

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Historial de erupciones

Resumen (VEI en el tiempo)
Haga clic en una barra para ver erupciones individuales
7620 BCE~7300 BCE · 1 erupciones · VEI máx. ?4416 BCE~4096 BCE · 1 erupciones · VEI máx. ?70~390 · 1 erupciones · VEI máx. 5390~710 · 1 erupciones · VEI máx. ?1351~1672 · 1 erupciones · VEI máx. ?1672~1992 · 42 erupciones · VEI máx. 27620 BCE5377 BCE2814 BCE571 BCE1672

Línea de tiempo detallada

  1. 1992VEI 2Observado
    1992-03-08 – 1992-05-21
  2. 1992VEI 1Observado
    1992-12-18 – 1992-12-18
  3. 1991VEI 2Observado
    1991-09-15 – 1991-10-29
  4. 1990VEI 2Observado
    1990-01-26 – 1990-01-26
  5. 1990VEI 2Observado
    1990-09-06 – 1990-10-01
  6. 1989VEI 2Observado
    1989-02-27 – 1989-03-28
  7. 1988VEI 2Observado
    1988-03-26 – 1988-07-20
  8. 1987VEI 2Observado
    1987-01-31 – 1987-06-24
  9. 1986VEI 2Observado
    1986-03-18 – 1986-06-30
  10. 1982VEI 2Observado
    1982-10-05 – 1983-05-16
  11. 1980VEI 2Observado
    1980-07-03 – 1980-07-08
  12. 1978VEI 2Observado
    1978-09-25 – 1978-10-16
  13. 1976VEI 2Observado
    1976-10-15 – 1977-05-09
  14. 1974VEI 2Observado
    1974-02-11 – En curso
    West flank ?
  15. 1973VEI 2Observado
    1973-03-16 – 1973-05-16
  16. 1972VEI 2Estimación geológica
    1972-09-16 – En curso
  17. 1962VEI 2Observado
    1962-11-05 – En curso
  18. 1953VEI 2Observado
    1953-07-02 – En curso
  19. 1951VEI 2Observado
    1951-10-16 – En curso
  20. 1948VEI 2Observado
    1948-04-29 – 1948-08-07
  21. 1946VEI 2Observado
    1946-12-16 – 1947-01-16
  22. 1931VEI 2Observado
    1931-05-16 – 1931-08-16
  23. 1929VEI 2Observado
    1929-05-16 – En curso
  24. 1927VEI 2Observado
    1927-07-02 – 1928-07-02
  25. 1912VEI ?Estimación geológica
    1912-07-02 – En curso
  26. 1911VEI 2Observado
    1911-07-02 – En curso
  27. 1908VEI 0Observado
    1908-02-22 – En curso
  28. 1907VEI ?Observado
    1907-07-02 – En curso
  29. 1896VEI ?Observado
    1896-07-02 – En curso
  30. 1895VEI 2Observado
    1895-08-01 – 1895-08-14
  31. 1892VEI 1Observado
    1892-09-23 – En curso
  32. 1887VEI 0Observado
    1887-07-02 – En curso
  33. 1883VEI 2Observado
    1883-07-02 – En curso
  34. 1867VEI ?Observado
    1867-07-02 – En curso
  35. 1865VEI ?Observado
    1865-07-02 – En curso
  36. 1862VEI ?Estimación geológica
    1862-07-02 – En curso
  37. 1852VEI ?Observado
    1852-07-02 – En curso
    NW flank (Lava Point)
  38. 1848VEI 2Observado
    1848-03-05 – En curso
  39. 1845VEI ?Estimación geológica
    1845-07-02 – En curso
  40. 1838VEI ?Estimación geológica
    1838-07-02 – En curso
  41. 1828VEI ?Estimación geológica
    1828-07-02 – En curso
  42. 1790VEI ?Estimación geológica
    1790 – En curso
  43. 1420 (±100 años)VEI ?Estimación geológica
    1420 – En curso
  44. 550VEI ?Estimación geológica
    550 – En curso
  45. 340VEI 5Estimación geológica
    340 – En curso
  46. 4150 a. C.VEI ?Estimación geológica
    BCE 4150 – En curso
  47. 7620 a. C. (±300 años)VEI ?Estimación geológica
    BCE 7620 – En curso

Enlaces externos

⚠ Solo como referencia. No apto para respuesta ante emergencias.